Integrated FCC Biomass Pyrolysis and Upgrading
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Solution Overview
Problem
The existing methods for biomass pyrolysis and pyrolysis oil upgrading are inefficient due to high oxygen and water content in bio-oil, leading to storage instability, phase-separation issues, and costly damage to cracking catalysts, making it difficult to produce high-value hydrocarbons effectively.
Innovation Solution
Integrating a biomass pyrolysis and pyrolysis oil upgrading process into a fluid catalytic cracking (FCC) unit, where a slurry stream of solid biomass particles and a solvent is fed into an FCC riser for pyrolysis and in situ upgrading, with catalytic cracking occurring simultaneously, allowing for the separation and regeneration of catalysts to produce upgraded fuel products.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If biomass pyrolysis is performed to produce bio-oil, then hydrocarbon building blocks are obtained, but the bio-oil contains high oxygen and water content leading to storage instability and phase-separation issues
Solution Approach 1:
The patent combines the pyrolysis process with an upgrading process in a single integrated system. The bio-oil produced from pyrolysis is immediately subjected to upgrading treatments including water removal, oxygen removal, and catalytic cracking within the same reactor system, eliminating the need for separate storage and handling steps that cause instability and phase separation.
Solution Approach 2:
The upgrading processes are performed immediately after pyrolysis while the bio-oil is still in the reactor, before it can undergo storage-related degradation. Water and oxygen are removed in advance through distillation and chemical treatment, and catalytic cracking is initiated promptly to convert unstable compounds into more stable hydrocarbons.
2Reliability
If pyrolysis oil is upgraded through conventional methods, then stability improves, but costly cracking catalysts are damaged and profit margins are reduced
Solution Approach 1:
The patent employs multiple upgrading mechanisms including water removal through distillation, oxygen removal through chemical treatment, and catalytic cracking using zeolite catalysts. These parameter changes transform the unstable, oxygen-rich bio-oil into a stable, upgraded product with improved storage characteristics and reduced corrosiveness.
Solution Approach 2:
The integrated system uses a combination of physical separation (distillation), chemical treatment (oxygen removal), and catalytic conversion (cracking) to achieve upgrading. This multi-pronged approach replaces the need for expensive, highly specialized catalysts by distributing the upgrading function across multiple simpler, more cost-effective processes.
3Adaptability or versatility
If bio-oil is stored for later processing, then operational flexibility is maintained, but storage instability and phase-separation issues occur
Solution Approach 1:
The patent merges the pyrolysis and upgrading operations into a single continuous process flow. The bio-oil moves directly from the pyrolysis zone through the upgrading zones without intermediate storage, maintaining compositional stability while preserving operational flexibility through continuous processing and adjustable operating parameters.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively upgrades biomass and long-chain petroleum compounds into fuel products like gasoline, diesel, and petroleum coke, reducing costs and improving the stability and usability of pyrolysis oil, while minimizing catalyst damage.
Implementation Method 1
catalytic cracking of the conventional FCC feed also occurs in the riser
Implementation Method 2
The solid products (coke and char) entrained by the catalyst are burned off in the regenerator
Implementation Method 3
The solid and vapor products are separated by cyclones in the FCC reactor
Implementation Method 4
The vapor (conversion) product is distillated into various streams including naphtha, LCO, and decant oil in the main fractionator
Implementation Method 5
a slurry pump, mixer, or combination of a mixer and slurry pump to transport the mixed feed stream to a riser
Data Source
AI summary
Integrating a biomass pyrolysis and upgrading process into a fluid catalytic cracking unit. The process uses conventional FCC feed and a mixture of a solvent and biomass to produce upgraded fuel products. A slurry stream composed of solid biomass particles and a solvent is fed into an FCC riser through a slurry pump to achieve biomass pyrolysis and in situ pyrolysis oil upgrading. The catalytic cracking of the conventional petroleum feed also occurs in the riser.